Grinding apparatus for pulverizing materials



= A ril 30, 1935.

w. A. SCOTT GRINDING APPARATUS FOR PULVERIZING MATERIALS Filed Jan. 18, 1932 2 Sheets-Sheet l Whiter/Z. S6066 M W IDWW' ATTORNEYS April 30, 1935. w A SCOTT 1,999,666

GRINDING APPARATUS FOR PULVERIZING MATERIALS Filed Jan. 18, 1932 Z Sheets-Sheet 2 INVENTOR IIQZZer/f. Staff ADW MJ 10% W ATTORNEYS tors 21 are arranged within the housing in proximity to the annular side wall l2 of the latter and are secured, through the medium of the radially extending arms 28, to the plate 26 for rotation therewith as a unit. The arrangement is such that rotation of the grinding disk 25 relative to the disks 22 to pulverize the pigment therebetween also effects a rotation of the agitators 21 to agitate the pigment in the lower portions of the housing and deliver the pigment to the funnel 24 whereupon it is conveyed to the space between the cooperating grinding disks 22 and 25.

As previously stated, it is one of the objects of the present invention to provide meansfor relatively moving the grinding disks away from each other to provide for the delivery of pigment to the space between the grinding disks. In the present instance, the grinding disk 22 is intermittently moved relative to the grinding disk 25 to provide for securing the above results and this is accomplished herein by providing acrank shaftv 29 extending at substantially right'angles to the drive shaft l8 and having age'ar30 fixed to the upper end thereof adapted to mesh with a relatively larger sized gear 3| on the shaft. The gear ratio between the shafts i8 and 29 is such as to rotate the latter shaft at a relatively slow rate of speed from the former and is determined in accordance with the intervals it is desired to move the grinding disk 22 relative to the'disk 25. Fixed to the lower end of the crank shaft 29 is a suitable crank 32 having the outer end thereof fixed to a suitable rod 33 for. reciprocating the latter. The rod 33 has a lost motion connection with the lower end of an oscillatable' lever 34 pivotally connected intermediate the ends thereof to the housing H] as at 35 and having a fork 36 at the upper end thereof adapted to engage asuitable collar 3'! which in turn is fixed to the shaft. l9. The lost motion connection between the lower end of the lever 34 and the rod 33 comprises a pair of axially spaced abutments 38 and 39 fixed to the rod 33 on opposite sides of the lower end of the lever 34. The lower end of the lever 34 is normally spaced from the abutment 38 by means of a spring 49 arranged under tension between the abutment 38 and the lower end of the lever 34 and encircling the rod 33. As will be observed from Figure 1, the location of the tension spring 40 is such as to normally urge the lower end of the lever 34 in the direction of the arrow 4| about its pivotal connection 35 and in so doing causes the fork 35 to act upon the collar 2! to slide the shaft l9, together with the grinding disk 22, axially inwardly toward the, rotatable grinding disk 25. Thus, it will be apparent that the above arrangement provides for securing another of the previously mentioned objects of the present invention in that it serves to lessen the space between the cooperating grinding disks as the pigment therebetween diminshes in size. Referring now to the operation of the construction previously described and assuming thatthe housing is substantially filled with the material to be ground and that the grinding disk 25 is rotating through the medium of the drive shaft IE, it will be noted that the agitatorswill serve to continuously agitate the material within the housing and distribute the sameinto the receiving end of the funnel 24. After the. material has been delivered to the funnel 24,,the same is discharged by the delivery end of the, funnel to thespace between the cooperating grinding disks 22 and 25, and since the former disk is non-rotatable and continuously urged toward the disk 25 by the action of the spring 40 previously described, the material between these disks will be thoroughly pulverized. After the disk I 8 has been rotated a predetermined number of revolutions depending upon the ratio of the gears 30 and 3|, the crank 32 will be moved from the full line position thereof shown in Figure 1 to the dotted line positionof the same causing the abutment 39 to engage the free end of the lever 34 and positively rock the same about its pivotal connection 35 in a direction to effect outward sliding movement of the shaft I9 and since the grinding disk 22 is fixed to the shaft I9, it necessarily follows that the same will be moved away from the disk 25. Movement of the disk 22 away from the disk 25 increases the area of the space between the disks and thereby permits the funnel 24 to deliver a quantity'of pigment to this space. Thus, from the foregoing it will be seen that while the disk 22 is nor mally yieldably urged toward the disk 25 by the spring 40, nevertheless, the same is periodically and positively moved away from the disk 25 by the crank 32 and abutment 39. In this connection, it' is to be noted that the abutment 39 is so positioned on the rod 33 that the same will not engage the lower end of the lever 34 to positively oscillate the same about its pivot 35 until the crank 32 approaches its dotted line position shown in Figure 1. As the crank 32 moves from its dotted line position shown in Figure 1 to the full line position thereof also'illustrated in Figure 1, the abutment 39 gradually moves away from the lower end of the oscillatable lever 34, thereby permitting reaction of the spring 40 upon the lever 34 to yieldably urge the grinding disk 22 towards the cooperating grinding disk 25.

The modification illustrated in Figures 3 and 4 differs from the previously described form of the invention in that the housing 59 is rotatably mounted and contains a plurality of pulverizing or grinding units 5|. The housing 5!! is substantially the same in details of construction as the housing I9 described in connection with the first embodiment of this invention, but differs therefrom in that it is fixed to the drive shaft 52 which extends axially through the housing and is journaled at the forward end thereof upon a suitable support 53. Encircling the drive shaft 52 inconcentric relation therewith and extending through the front wall of the housing 50 is a sleeve 54 nonrotatably supported and capable of axial sliding movement relative to the drive shaft and housing.

As indicated above, a plurality of grinding units 5| are provided within the housing 50 having cooperating members carried respectively by the axially movable sleeve and rotatable housing. In detail, the housing'is provided with a plurality of circumferentially spaced shafts 55 located within and extending substantially parallel to the axis of the housing. The front and rear ends of the shafts 55 are suitably rigidly secured to the corresponding end walls of the hous ing so as to provide for rotation of the shafts 55 as a unit with the housing about the axis of the drive shaft. Each of the grinding units 5| are provided with rotatable grinding disks 5G centrally apertured for the passage of the sleeve therethrough and rigidly secured to suitable backing plates 51 having the periphery thereof apertured for receiving the shafts 55. The plates 51 are preferably slidably mounted upon the shafts '55 and are normally yieldably urged toward the nonrotatable grinding disks 58 by means of suitable coil springs 59 carried by the shafts 55 in the manner clearly shown in Figure 3 of the drawneeaccc ings. 'ihe cooperating grinding disks; 5.8 are rigidly secured in any suitable manner to backing plates til:- having hub portions 6.1 rigidly secured to the sleeve by meansof the set screws $2.. The. arrangementis such as to providefor axial movement of thecooperating disksaiil. asaunit withthe sleeve; 55; Rigidly; secured to each of. the backing plates fit are funnels having therdeliveryends extending through the grinding; disks: 58 in communication with the space between: the latter disks andthe rotatable: disks 5.6; The receiving ends of the funnels: 63- project upwardly beyond the peripheries of the disks-5.8 and: areadapted to receive the material orpigment within the housing to be pulverized as the latter housing. is rotatedlby the driveshaft;

With the construction as thus. far-described, it will be apparent that, rotation of the housing by the drive shaft will also effect a rotationof the grinding disks 56. relative tothe grindingv disks 53. It will further be seen thatthe grinding disks 56. are yieldably urged toward .the cooperating disks 53. by means of the springs 59 so as to lessen the space between the disks aszthe material therebetween is diminished in size: In this-connection, it is to be noted that axialmovement of. the rotatable disks 55. relative to the cooperating nonrotatable disks 58 is.- limited by means of suitable pins 5% extending transversely through the shafts 55 in advance of the plates 66 for engagement therewith. By'rotating the housing in the manner specified above, the pigment. or material to be pulverized within the housing is. delivered to the funnels without the provision of agitators of the type set forth in the above described form of the invention. I

Movement of the disks 58: relative to the cooperating rotatable disks 56: in a direction away from the latter to, provide for delivering the pigment in the funnels 63 to the space between the aforesaid disks is also accomplished in: the present instance periodically and automatically. In the present modification, the above results are secured by intermittently sliding: the sleeve 54 relative to-the driveshaft 52 and the means provided herein for sliding the. sleeve in the above manner is identical. inprinciple to the means set forth in connection. with the first described form of the invention for axially movingthedisk 22. In detail, a crank shaft 6.5 isjournaled. upon the support 53- and is drivenfrom the driveshaft 52 through the gearing 6.5and- $6 The ratio of the gearing is such that the crank shaft willbe rotated at a relatively slow rate of speed from' the drive shaft depending upon. the intervals it is desired to move. the, grinding. disks 58' away 54 and collar 1L from the cooperating.- disks 56-. Asin. the first described. form of the invention, the crank shaft 66 is provided with a crank G! secured. to a rod $8 for reciprocating. the latter... The rod 63 in turn -has a slidable lost. motion; connection with the free end of. lever 69 .pivotally. connected intermediate the ends. thereof as at '58 tothe support 53 and having. the upper end. engaging. a suitable'collar it fixed to the sleeve 54. Mounted upon therod. 63 is-a suitable abutment l2. opera able upon movement of. the crank 61 to-the dotted line position. thereof illustrated in. Figure 3' to engage the lower end of the lever 69 and. rock the same about. its pivotal connection H1 in the direction of the arrow 13. Rocking. movement of. the lever in the aforesaid direction obviously provides for. movement of the-disks 5.8 away from the disks. ELS- through the medium of the sleeve Movement ofthelever by the abutment 1.2- is: normally" resisted by a. spring bi. encircling the; rod: 68 on the opposite side of the lever and. arranged under tension. between. the lever anda. second. abutment 1.5... As. be: apparent fromv Figure 1,. thespring ltd; tendsto urge the. lever 69: in a direction: opposite the arrow 5.3. and accordingly cooperateswith the: springs 53 to yieldably urge the disks 58 and 56. toward each other;

While two emhodiments;of. the invention have been shown and described herein. somewhat in. detail, neverthelessit. iszto be understood that the several novel features; of the. present invention. may be secured by various different types of arrangements and accordingly, reservation. ismade to makesuch: changes as. may come within the purview of the accompanying, claims;

What I claim assmy invention. is":

lain; a machine forpulverizing. materials, the combination with a housing. adapted to contain the; material to be pulverized, of a pair. of role.- tively rotatable grinding members mounted in axial alignment within the"v housing and having cooperating grinding surfaces spaced axially from each other, means, for collecting the material within the housing;anddischargingthe same into the space between the cooperating grinding surfaces including a funnel, a rotatable agitator within the. housing for delivering the material therein to said funnel and .means for relatively rotating said grinding. members topulverize the materials introduced between the: aforesaid grinding surfaces thereof.

2. In a machine for pulverizingmaterials; the combination with. a housing. adapted to contain the material? to be pulverized, of a pair of grindingdisks mounted within the housing in axial alignment and having cooperating grinding surfaces spaced axially from each. other, means for. collecting the material within the housing and discharging the-same into thespace between the cooperating grinding surfaces of the disks in cluding afunnel carried by one of said disks and communicating with said space; means for rotating the other of said disks relative to said first named disk, and means carried by said rotatable disk for agitating the material. in the housing and conveying, the same to said funnel.

3. In a machine for'pulverizing materials, the combination with a housing adapted to contain thematerial to be pulverized, of a. pairv of; relatively rotatable grinding members mounted within the housing and having cooperating grinding surfaces positionedopposite each other in spaced relationship for receiving therebetween materials to be pulverized, means for mounting the grinding members within. the housing permitting relative movement of the members in directions to increase and decrease the space between the cooperating grinding surfaces-thereof, means for relatively rotating the grinding members, to pulverize the materials between the aforesaid grinding surfaces, and means for automatically moving the members relative to. each other to decrease the space between; the cooperating grinding surfaces thereof asthe material therebetween. diminishes in size; 7

4. Ina machinefor pulverizing materials, the combination with a housing adapted to contain the material to be pulverized; of' a pair of" relatively rotatable grinding members arranged with.- in the housing in axial alignment. and. having cooperating grinding surfaces spacedaxially from each other, means for delivering. the. material within the housing to. the spacebetween: the: co.-

operating grinding surfaces aforesaid, means for relatively rotating the grinding members to pulverize the materials between the grinding surfaces thereof, means for mounting said grinding members within the housing permitting relative axial movement thereof to diminish the space between the cooperating grinding surfaces thereof, and yieldable means normally relatively urging said grinding members toward each other as the materials between the said cooperating grinding surfaces decrease in size.

5. In a machine for pulverizing materials, the combination with a housing adapted to contain the material to be pulverized, of a pair of grinding members located within the housing in axial alignment with each other and having cooperating grinding surfaces positioned opposite each other in spaced relationship, means for rotating one of said grinding members, means for moving the other of said grinding members axially toward and away from the grinding member aforesaid, means for automatically moving said second grinding member toward the first named member to diminish the space between the grinding surfaces as the material in said spacediminishes in size, and means for periodically moving said second mentioned grinding member axially away from the first named grinding member to increase the space therebetween and provide for the delivery cf material to said space. V

6. In a machine for pulverizing materials, the combination with a housing adapted to contain the material to be pulverized, of 'a pair of relatively rotatable grinding members having cooperating oppositely positioned grinding surfaces spaced from each other to permit the materials to be pulverized to assume a position therebetween, means for mounting said grinding memhere within the housing permitting relative movements thereof in directions to increase and decrease the space between the grinding surfaces aforesaid, means for relatively rotating said grinding members to pulverize the materials therebetween, means for automatically relative- 1y moving said grinding members in a direction to decrease said space as the material between the grinding surface diminishes in size, and means for periodically relatively moving said grinding members away from each other to increase the space therebetween so as to permit the introduction of additional material to said space.

'7. In a machine for pulverizing materials, the combination with a housing adapted to contain the material to be pulverized, of a pair of relatively rotatable grinding members having cooperating oppositely positioned grinding surfaces spaced from each other to receive therebetween the materials to be pulverized, means for relatively rotating said members to pulverize the materials between the grinding surfaces thereof, means for mounting said grinding members within the housing permitting relative movements thereof in directions to increase and decrease the space between the grinding surfaces aforesaid, means for automatically relatively moving said grinding members in a direction to decrease said space as the material between the grinding surfaces diminishes in size, means for periodically relatively moving said grinding members away from each other to increase the space therebetween, and means operable during the interval said grinding members are moved relatively in the last mentioned direction to deliver material from the housing to said space.

8. In a machine for pulverizing materials, the combinationwith a housing adapted to contain the material to be pulverized, of a pair of grindingmembers arranged in axial alignment within the housing and having cooperating grinding surfaces positioned opposite each other in spaced relationship, a drive shaft connected to one of said members for rotating the same relative to the other, means mounting said second mentioned grinding member for axial movement toward and away from said first mentioned grinding member, yieldable means normally urging said second grinding member toward the first mentioned member to diminish the space between the grinding surfaces aforesaid thereof, and means operated by said drive shaft for periodically moving said second member away from said first named member to increase the space between said grinding surfaces.

9. In a machine for pulverizing materials, a rotatable housing adapted to contain thematerial to be pulverized, means forrotating theihousing to agitate the materials therein, a pair of relatively rotatable grinding disks mounted within the housing, in axial alignment and having cooperating grinding surfaces positioned opposite eachother in spacedrelationship, means positioned-within the housing for collecting the material agitated thereby and for delivering the material to the space between the grinding surfaces aforesaid and means for relatively rotating the disks to pulverize the materials therebetween.

10. In a machine for pulverizing materials, a rotatable housing adapted to contain the material to be pulverized, means for rotating the housing to agitate the materials therein, a grinding disk mounted within the housing coaxially with the axis of rotation of the latter, means connecting said grinding disk to the housing for rotating the former as a unit with the latter, a non-rotatable grinding disk mounted within the housing in axial alignment with the disk aforesaid and in spaced relation thereto, and means fixed to said last mentioned disk for collecting the material agitated by the housing and for delivering said material to the space between said disks.

11. In a machine for pulverizing materials, a rotatable housing adapted to contain the material to be pulverized, means for rotating the housing to agitate the materials therein, a plurality of grinding units arranged within the housing for pulverizing the material therein, each of said units comprising, a grinding disk rotatable as a unit with the housing, a non-rotatable grinding disk spaced-axially from the rotatable disk, and a hopper for delivering material from the housing to the space between said disks.

12. In a machine for pulverizing materials, a housing adapted to contain the material to be pulverized, a plurality of grinding units arranged within the housing for pulverizing the material therein, each of said'grinding units comprising, a rotatable grinding disk, a non-rotatable grinding risk arranged in axial alignment with the disk aforesaid and in spaced relation thereto, means for rotating the first named disk of each unit to pulverize the materials between the latter and non-rotatable disks, means for auto matically and simultaneously moving. all of said non-rotatable disks axially toward the rotatable disks as the material between the grinding surfaces thereof diminishes in size, means for simultaneously and periodically moving all of said non-rotatable disks axially away from the rotatable disks to increase the space between the grinding surfaces thereof, and means for delivering material from the housing to the space be-- tween each of said cooperating disks.

13. In a machine for pulverizing materials, a rotatable housing adapted to contain the material to be pulverized, means for rotating the housing to agitate the materials therein, a plurality of grinding units arranged within the housing for pulverizing the material therein, each of said units comprising, a disk rotatable as a unit with the housing, a non-rotatable disk arranged in axial alignment with the disk aforesaid and in spaced relation thereto, means for automatically and simultaneously moving all of,

said non-rotatable disks axially toward the rotatable disks as the material between the grinding surfaces thereof diminishes insize, means for simultaneously and periodically moving all of said non-rotatable disks axially away from the rotatable disks to increase the space between the grinding surfaces thereof, and means for delivering material from the housing to the space between each of said cooperating disks.

14. In a grinding machine for pulverizing materials, the combination with a housing adapted to contain the material to be pulverized, of a pair of relatively rotatable grinding members mounted within the housing and having oppositely arranged cooperating grinding surfaces spaced from each other, means for collecting the material within the housing and discharging the same into the space between the cooperating grinding surfaces on said members, means for periodically relatively moving said grinding members axially, and means for relatively rotating said members to pulverize the materials therebetween.

15. In a machine for pulverizing materials, a housing adapted to contain theimaterial to be pulverized, a plurality of grinding units arranged within the housing for pulverizing the material therein, each of said units comprising, a rotatable grinding disk, at non-rotatable grinding disk arranged in axial alignment with the disk aforesaid and in spaced relation thereto, means for periodically relatively moving the grinding disks of each unit away from each other to increase the space therebetween for receiving the material to be pulverized, means for rotating the first named disk of each unit, and means for simultaneously relatively moving the disks of each unit axially toward each other.

16. In a machine for pulverizing materials, the

combination with a housing adapted to contain the material to be pulverized, of a pair of opposed relatively rotatable grinding members mounted within the housing with the adjacent grinding surfaces spaced from each other to receive the material to be pulverized, means for periodically relatively moving said grinding members axially, and means for simultaneously relatively rotating said members to pulverize the material therebetween.

17. In a grinding machine for pulverizing materials, the combination with a housing adapted to contain the material to be pulverized, of a pair of opposed grinding members mounted within the housing with the adjacent grinding surfaces spaced from each other to receive therebetween the material to be pulverized, means for relatively rotating said grinding members, means for relatively moving the grinding members toward each other during relative rotation of the same to pulverize the material therebetween, and means for periodically relatively moving the grinding members away from each other.

WALTER A. SCOTT. 

